linux-kernel - Re: [PATCH 4/4] x86: Ignore stack unwinding in KCOV

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Message-ID: <CAG_fn=Vwu0X2ORoins8m=dgNQpgiu3euUB7wu+ix1mOXDo4GFg@mail.gmail.com>
Date: Tue, 4 Jun 2024 17:06:41 +0200
From: Alexander Potapenko <glider@...gle.com>
To: Dmitry Vyukov <dvyukov@...gle.com>
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, 
	dave.hansen@...ux.intel.com, x86@...nel.org, linux-kernel@...r.kernel.org, 
	syzkaller@...glegroups.com, elver@...gle.com, nogikh@...gle.com, 
	tarasmadan@...gle.com
Subject: Re: [PATCH 4/4] x86: Ignore stack unwinding in KCOV

On Tue, Jun 4, 2024 at 3:45 PM 'Dmitry Vyukov' via syzkaller
<syzkaller@...glegroups.com> wrote:
>
> Stack unwinding produces large amounts of uninteresting coverage.
> It's called from KASAN kmalloc/kfree hooks, fault injection, etc.
> It's not particularly useful and is not a function of system call args.
> Ignore that code.
>
> Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: syzkaller@...glegroups.com
Reviewed-by: Alexander Potapenko <glider@...gle.com>